increment and decrement statements in javascript code example

Example 1: decrement operator in javascript

// Decrement
let b = 1;
b--; //post decrement
--b; // pre decrement

Example 2: how to increment variable value in javascript

var a = 1;
      function increase(){
            var textBox = document.getElementById("text");
            textBox.value = a;
            a++;
      }